SSC CGL Tier II 21 Sep 2014 Paper

Question : 4 of 100

Marks: +1, -0

If the surface area of a sphere is 346.5 cm

^{2}

, then its radius

[ \taking \π= {22}/{7} ]

Solution:

(3) Surface area of sphere

=4\πr^2

∴ 4 ×{22}/{7} × r^{2}=346.5

⇒4 ×22 × r^{2}=346.5 × 7

⇒ r^{2}= {346.5× 7}/{4 × 22}=27.5625

∴ r=√{27.5625}=5.25 {cm}

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